[floranorthamerica.org] Range, Variety Info: Ribes amarum occurs in central and southern California and in the central Sierra Nevada southward. Plants from the Santa Ynez Mountains of Santa Barbara County with hairy fruits have been named var. hoffmannii. (link added by Mary Ann Machi)
Calflora:
Information on California plants for education, research and conservation,
with data contributed by
public and private institutions and individuals.
[web application]. 2025.The Calflora Database
[a non-profit organization].Available:
https://www.calflora.org/(Accessed: 04/01/2025).